The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 09, 2003
Filed:
May. 22, 2001
Terence J. Murphy, Plano, TX (US);
James E. Chloupek, Plano, TX (US);
Texas Instruments Incorporated, Dallas, TX (US);
Abstract
A driver ( ) for supplying drive signals to a piezo element ( ) of a milli-actuator device ( ) in a mass data storage device ( ) in a charge mode of operation has a first circuit ( ) for providing a charging current to a sense capacitor ( ) in response to head position control signals. The first circuit is powered by a voltage supply (VM) that is referenced to a substrate potential, or a ground potential (AGND). A second circuit ( ) for mirroring a current in the first circuit at a predetermined mirror ratio (1x:Nx) to provide drive currents to the piezo element ( ). The substrate potential may be, for example, an analog ground potential. If desired, the integrated circuit may also include a first switch ( ) connected to selectively disable the first circuit ( ) a second switch ( ) connected to selectively provide a feedback path from the second circuit ( ) to an input of the second circuit ( ). When the first ( ) and second ( ) switches are selectively operated, the integrated circuit is configured to operate in a voltage mode.